ref: c4305ba57d050dd5c7c229fa38bf2f9325a772d1
parent: 5cbd333f3b491f6ecb41387acf72e8ec27d8a474
author: Yunqing Wang <yunqingwang@google.com>
date: Fri Dec 21 09:46:52 EST 2018
Adjustment to noise factor in first pass. Adjustments to the calculation and use of a noise estimate in the first pass Q estimate and adaptation of temporal filtering. This change was tested and gave gains for both auto-alt-ref=1 and auto-alt-ref=6 as follows: Results are Av PSNR, Overall PSNR, SSIM and PSNR-HVS auto-alt-ref=1 low_res 0.007, -0.042, -0.018, 0.074 mid_res -0.142, -0.239, -0.173, -0.129 hd_res -0.322, -0.405, -0.397, -0.367 NF_2K -0.058, -0.099, -0.201, 0.028 auto-alt-ref=6 low_res -0.058, -0.171, -0.188, -0.027 mide_res -0.149, -0.155, -0.171, -0.137 hd_res -0.252, -0.339, -0.259, -0.297 NF_2K -0.015, -0.068, -0.120, 0.092 In all sets there were some winners and losers but significantly more winners. The biggest change was Stockholm in the hd set with an improvement of 5-6% Change-Id: Ieec71e1c4e3e09b76c288efa7b4d1b00015b3a11
--- a/vp9/encoder/vp9_firstpass.c
+++ b/vp9/encoder/vp9_firstpass.c
@@ -549,7 +549,7 @@
}
#define FP_DN_THRESH 8
-#define FP_MAX_DN_THRESH 16
+#define FP_MAX_DN_THRESH 24
#define KERNEL_SIZE 3
// Baseline Kernal weights for first pass noise metric
@@ -843,6 +843,7 @@
double mb_intra_factor;
double mb_brightness_factor;
double mb_neutral_count;
+ int scaled_low_intra_thresh = scale_sse_threshold(cm, LOW_I_THRESH);
// First pass code requires valid last and new frame buffers.
assert(new_yv12 != NULL);
@@ -1254,7 +1255,6 @@
}
}
#endif
-
// Does the row vector point inwards or outwards?
if (mb_row < cm->mb_rows / 2) {
if (mv.row > 0)
@@ -1280,14 +1280,13 @@
else if (mv.col < 0)
--(fp_acc_data->sum_in_vectors);
}
- fp_acc_data->frame_noise_energy += (int64_t)SECTION_NOISE_DEF;
- } else if (this_intra_error < scale_sse_threshold(cm, LOW_I_THRESH)) {
+ }
+ if (this_intra_error < scaled_low_intra_thresh) {
fp_acc_data->frame_noise_energy += fp_estimate_block_noise(x, bsize);
- } else { // 0,0 mv but high error
+ } else {
fp_acc_data->frame_noise_energy += (int64_t)SECTION_NOISE_DEF;
}
} else { // Intra < inter error
- int scaled_low_intra_thresh = scale_sse_threshold(cm, LOW_I_THRESH);
if (this_intra_error < scaled_low_intra_thresh) {
fp_acc_data->frame_noise_energy += fp_estimate_block_noise(x, bsize);
if (this_motion_error < scaled_low_intra_thresh) {
@@ -2399,8 +2398,12 @@
twopass->arnr_strength_adjustment = 0;
- if ((section_zeromv < 0.10) || (section_noise <= (SECTION_NOISE_DEF * 0.75)))
+ if (section_noise < 150) {
twopass->arnr_strength_adjustment -= 1;
+ if (section_noise < 75) twopass->arnr_strength_adjustment -= 1;
+ } else if (section_noise > 250)
+ twopass->arnr_strength_adjustment += 1;
+
if (section_zeromv > 0.50) twopass->arnr_strength_adjustment += 1;
}